HK MR556 A4 5.56x45mm 11-inch Threaded Barrel
The Heckler & Koch MR556 A4 is an 11-inch-barrel semi-automatic MR-series pistol chambered in .223 Rem / 5.56 NATO with a threaded barrel, M-LOK handguard, ambidextrous controls and black finish.
$3,749.00
25 in stock
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Product Details
The Heckler & Koch MR556 A4 is the commercial MR-series update inspired by the HK416 platform, built around a short-stroke gas piston system and an adjustable gas regulator. This compact 11-inch configuration pairs a threaded barrel with an M-LOK handguard and a black anodized finish. Fully ambidextrous controls and a slim profile emphasize controllability and user ergonomics for compact duty, range use, and utility applications.
Key Specifications
- Manufacturer: Heckler & Koch / H&K.
- Model: MR556 A4.
- Caliber: .223 Rem / 5.56 NATO.
- Barrel length: 11 inches.
- Barrel type: Threaded.
- Action: Semi-Auto.
- Weight: 6.61 lb.
- Overall length: 26.50 inches.
- Handguard: M-LOK.
- Rate of twist: 1-in-7.
With its short-stroke piston operation and adjustable gas regulator, the MR556 A4 is designed for reduced maintenance and consistent performance in compact configurations. The combination of an 11-inch threaded barrel, M-LOK modularity, and ambidextrous ergonomics makes it a well-rounded option for shooters seeking a reliable, service-oriented platform for range work and compact utility roles.
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Additional information
| UPC | 642230269446 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 81001051 |
| Action | |
| Barrel Length | 11" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Capacity | 10 + 1 |
| Safety | Ambidextrous Safety Lever |
| Color | Black |
| Model | |
| Product Type | AR |
| ATF Type | RIFLE |
| Package Width | 13.0 |
| Package Height | 4.0 |
| Number of Magazines | 1 10 rd. |
| Shipping Weight | 11.1 |
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